Guelder rose

Viburnum opulusAdoxaceaeShrub

A native hedgerow viburnum with a clever flower head: a ring of large showy sterile flowers around the outside advertising for insects, and a mass of small fertile ones in the middle doing the actual work. The sterile ring is pure signalling, and the wild plant is a far better bee plant than the garden snowball form, which has converted every flower to the sterile kind.

Value to bees

Nectar
High
Pollen
Moderate
As a honey crop
Feeds the colony but rarely yields a surplus
Which bees, and why
Worked by small solitary bees, hoverflies and beetles as much as by honey bees. The flat head of tiny open florets is a landing platform, and the sterile ring exists solely to make it visible from a distance.

Tiny fully open fertile florets with exposed nectar — accessible to the smallest insects.

Worth knowing
Good accessible nectar in early summer, and a useful lesson in reading a flower — most of what you can see is advertising rather than reward.

Flowering

In flower
May to July (northern hemisphere)

Four to six weeks in early summer, after the hawthorn.

When nectar flows
Good nectar from the small fertile central florets, freely accessible. The showy outer ring produces nothing at all.
Year-to-year variation
Reliable and modest.

Growing it

Conditions
Sun or part shade, moist soil. It prefers damp ground and tolerates heavy clay.
Size
2-4 m.
Native range
Europe, North Africa and central Asia, in damp woodland and hedgerow.
Suits
Hedgerow, Large gardens, Small gardens
  • Plant the wild species, not the 'Roseum' snowball form — that cultivar is entirely sterile flowers and offers nothing to any insect.
  • Excellent native hedgerow shrub with spring flowers, autumn colour and winter berries.
  • The berries persist into winter because birds take them late, which makes it useful in hard weather.

What it looks like

A spreading shrub with three-lobed maple-like leaves and flat white flower heads ringed by large sterile florets, followed by translucent red berries and good autumn colour.

Sources

  • Field Guide to the Bees of Great Britain and IrelandBloomsbury (2015) · Field guide
  • HoneyHQ editorial synthesisHEKNO Ltd · HoneyHQ synthesis

How sources are selected and weighted is set out in the sources and evidence policy.

Guides covering this plant

Tools for planning planting

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